中国计量大学学报2026，Vol.37Issue(1)：71-81,11.DOI:10.3969/j.issn.2096-2835.2026.01.008
分布式光伏接入对变压器中性点过电压特性的影响研究
Research on the impact of distributed photovoltaic integration on the overvoltage characteristics of transformer neutral points
摘要
Abstract
Aims:This paper aims to quantify the impact of distributed photovoltaic(PV)integration on the neutral-point overvoltage of 110 kV ungrounded transformers and to assess the adaptability of the coordinated protection scheme composed of a protective gap and a metal oxide arrester(MOA).Methods:A 110 kV transmission system model with distributed PV was established in the alternative transients program-electromagnetic transients program(ATP-EMTP);and the neutral-point overvoltage responses under typical fault conditions were simulated and analyzed.Results:Distributed PV integration significantly changed the distribution characteristics of neutral-point overvoltage.Under single-phase-to-ground faults,sustained current feeding from PV raised the neutral-point voltage from 41.8 kV to the critical gap discharge range of 43.6～72 kV,markedly increasing the risk of gap maloperation.Under two-phase disconnection faults,PV suppressed the overvoltage amplitude.But the voltage dropped from 72.02 kV into the same critical range,reducing the reliability of gap operation and increasing the risk of insulation coordination failure.Under lightning faults,PV integration had little influence on the transient neutral-point overvoltage.Conclusions:The conventional fixed-gap protection scheme is no longer fully suitable for the more complex voltage behavior introduced by PV integration.The proposed controllable gap strategy based on amplitude-time dual criteria can effectively avoid maloperation and failure-to-operate risks in the critical range.关键词
分布式光伏/中性点过电压/避雷器/保护间隙/绝缘配合Key words
distributed photovoltaic generation/neutral point overvoltage/surge arrester/protective gap/insulation coordination分类
信息技术与安全科学引用本文复制引用
韦沅利,王颖,彭永康,蒋旭,邹国平..分布式光伏接入对变压器中性点过电压特性的影响研究[J].中国计量大学学报,2026,37(1):71-81,11.基金项目
国家自然科学基金项目(No.52377017),国网浙江省电力有限公司科技项目(No.B311TZ25Z001) （No.52377017）
